Machine tool structure



March 8, 1938. B. P. GRAVES l 2,110,295 l A MACHINE TOOL STRUCTURE Filed June 2, 1954 Y 2 sheets-snee; 2

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Illlln INVENTOR.

enanas Mar. s, 193ev MACHINE Toor. STRUCTURE Benjamin P. Graves, Edgewood, R. I., assigner to Brown & Sharpe Manufacturing Company, a

corporation of Rhode Island Application June 2, 1934, serial No. #3,741

9 Claims.

This invention relates to a machine tool structure; and has for one of its objects the provision of greater rigidity for the support of the spindle upon which the cutters are mounted.

Another object of the invention is the provision of a more rigid overarm` support for the spindle which assists in preventing vibration of the spindle during its operation.

Another object of the invention is the provit sion of a standard having an overhanglng portion in which the spindle and overarms are mounted and which will permit the table to pass beneath the overhang with the vise or fixture and work mounted therein.

T7' Another object of the invention is to shorten up the arbor.

Another object of the invention is to provide a more convenient mounting for attachmentsv by v reason of structures possible with the overhang l of the standard.

Another object of the invention is to provide a mounting on the machine for an' attachment when the attachment is not in use.

Another object oi the invention is the provigr, sion of means for swinging this attachment from its inoperative mounting on the machine to its operative position on the machine, whereby the operator does not have to support the weight of the attachment at any time during its movement :zu between its two positions.

:T3 position on the machine.

With these and other objects in view, the invention consists of certain novel features of construction, as will be more fully described,v and particularly pointed out in the appended claims.

l.) In the accompanying drawings:

Fig. l is a side elevation illustrating the new overhanging portion at the top of my machine tool structure;

Fig. 2 illustrates the upper end of this struc- 3 ture in a similar view with an attachment mounted in place;

Fig. 3 is a sectional View through the overhanging portion upon which the attachment is mounted, also illustrating the openings for the :o overarms and spindle;

Fig. 4 is a sectional view of the upper end of the machine showing the bearings of both the spindle and the overarm;

Fig. 5 is a perspective view illustrating theside 55 of the machine on which the attachment is 60 crane also on the upper end ofthe machine;

(Cl. Sli-11) Fig. 'I is a top plan view illustrating diagrammatically the swinging of the attachment from its inoperative to its operative position by means of the crane, the inoperative position being illustrated in dotted lines. n

The usual rigid standard is made with its front surface and back surface each in substantially the same vertical plane throughout its length withy these surfaces parallel to each other throughout their extent. The knee is usually mounted for vertical movement along the front surface or face of this standard, and the cutter arbor and the overarm extend from the standard at a point above the knee. Even in the rigidly formed standard such as I have mentioned, if the machine be pushed hard, there will be an uneven cut and sometimes cutter breakage, and in order to provide a better supportv for the spindle, I have projected or formed an overhanging vportion of this standard at the upper end thereof, which provides a greatly increased bearing for the spindle and the overarm, the latter of which is longitudinally slidable in bearings in the overhang, and also provides by reason of the height at which this overhang is located, an opportunity for'the Work carriage to extend beneath it, and thus I may operate on the work close to thecutter with the' cutter close to its bearing or support, and thusv there will be no unevenness in the cut taken.

Also by reason of this projecting or overhanging portion of the standard, I provide a surface to which the usual ,attachment may be more readily secured, and by reason of having this surface out of line with the guideway upon which the knee slides, I may use lugs for securing the attachment in place, which lugs will be out of the way and will not interfere with the sliding of the knee, as would be the casein the old form wherein the securing surface is in the same vertical plane in which the knee slides.

I also provide amounting for the attachment on one of the surfaces of the machine which is ordinarily not used; and further, I provide a crane by which the attachment may be removed from this storage position to its operative position without its being necessary for the operator to lift the weight of the attachment, which greatly facilitates the use of the attachment, the crane being such that the attachment may be moved up and outwardly so as to clear the corner of the machine in moving from one position to the other, which positions are usuallyA at right angles to each other, the same cap bolt being used for securing it in inoperative storage position as are used for securing it in operative position. Also, where such overhang is lacking, lugs or cap bolt cannot be screwed directly into the standard, as this standard provides an oil-tight pocket for the lubrication of the parts, and such opening woulalrtere with ma `.uow me lubri- 'cant to escape; and'.l the following is aV more detailed description ofthe present embodiment of this invention.jillustrating the preferred means by 'which these advantageous results may be accomplishedu with reference to the "drawings, n designates a base from which there extends upwardlyf a` standard i'i which is rigid throughput its height and encloses certain operative mechanisx'nfor the V milling machine here shown, with 'dierent controis designatedgenerally I2.. I3 and Il, shown side fAy guideway Vor. Vs lideway i! u is providedon'the Irontof this standard upon [which-there is mounted a knee AII for vertical sliding movement. which may beraised or lowered to positionl the workV to' a suitable 'height' from the cutter.` A control for the vertical positionvoflthe knee isy illustrated `iitflfl, andrion the knee there is located a reciprocable work carriage `Il which may suitably mounted in yaccordance rigged on'the crane ing.

ing2l located at the withthe usual practice for in and out movement upon a slide it This carriage receives suitable driving motion4 from .the mechanism within the standard Il as is well known in the art. and'I have illustrated in dotfdash lines in Fig. 1 the kwork 2l as mounted in position.

Thestandard lis cast in a shape to providean yintegral overhanging'portion-M jutting out from its uppe'rendforwardly over the'work'carriage i and kneeto` provide a rigid support, .and through this over-hanging, portion there extends1 the `spinydle 22 and the overarms 22. The overarms 2l `aresupported in split "bearings or clamps Il and l2 the forwardone li of which is located in the overhanging portion to .provide an increased length of supportinfthe rigid standard as one bearing is beyond and forward .of that which would be afforded if the standard did not have K4this overhangingl portion 2i, but merely had its .front edge extending upwardly in `line with the slideway lli A pluralityof bearings 21, 28 and 2! are providedfor the spindle. .Front bearing 21 is located inthe overhanging portion,` inter- .mediate' bearing .2Q `is located approximately` above. the front wall o'i' the standard and lrear .is locatedin the. rear Ywall of the a -overhanging portion ofthe bearing 2 2 standard. The pair of bearings 21 and `2l work together to takeoppositethrust, while the rear bearing 2,8 is more or less of a guide. This over-A hanging portiontl'rus by enabling these bearings to be spaced furtherapart provides an increased supportfor` the spindle 22 by reason of the bear- 2 1 for the outer endbeing located closer 'to work and a greater distance from the bearopposite end. The bear` ing 21 aifords a support much closer to the cutters when they are operating on the work, and thus this .overhangingportiom the work may also exthe tend ,beneaththe' `"cutters to a greater extent and greater lflexibility of the sliding movement of the work is afforded; ifThus, thereis a `greater throat distance provided` enabling a greater `range of `movement andoperationxup'on the work. Thes'e overarms are'provided on their uter ends with aA yoke 24 which provides a bearing 25"for the outer end oi the cutter larbor 22a,y upon which arbor` the cutters `26 are mounted in the usual way. guide'way 20 of the overhangfinished and-provides an abutment surface for an attachment 3i- The face of the ing portion 2| is thepost 33 mounted standard.: This crane H place. -iv This .attachment whereby the attachment` is prevents chattering. Further, by' reason of :which is Y `vidingrecesses in surface iltojreceive the ends `o ilthe` overarms which are, 'slid inwardly -lo'aa to leave them projecting a short beyond the surface 30; jandinorderto secure this attachment in place, vIlhave providedl lugs on either side of this surface with threaded openings ll therein which will'receive cap screws j rotatably mounted in openings 8l in the attach` ment and r ig`a'.ging`V threaded. opening l1 inthe standardV to'.; hold the attachment securely in receiv'egits 4drive from the spindle shaft* which `has a key in the end thereof `to fit a recess of the attachment.4 u r The crane'n` is provided with diiferent level surfaces.r `There is v a that whenthe drop 24 h'a'sits wheel engaging this surface ,zthe attachmcnt'lll'be at the proper level to be boltedontothe surface ll y on the side of the machinewhich is the inopera- 4tive storage position in .whichfthe attachment Ii ls` carried onthe used to thread into a sultableollening4 along this surface, 1.42 to secure the attachment in' this position. This position of mounting mentwhennot in use. sav. taking ment completely -oif .and separating it'froml the machine for. storage in the stock. yroomofhiihe shop, which y "heavy portion. thereby consuming considerable 'time .andconsiderable physical when it is desired to move the attachment from `its inoperative position, `as illustrated in'l'lgure 5, up against the surface thedrop Il is moved outwardly onthe .craneby means of the ,wheelfl2 sliding upwardly along the inclined surface Il and onto the raised surface :from its inoperative position jon"'surfac'e, to'a position in which the 'crane may now be swung inL driven member surface. s: s' heights u or the eurams` imovedioutwardly um `e. baisse um;

the l"attach- 'the attllehnecessitates the carrying of i by rotating;Y n on itsy pivot u. such .amusantes 1 in Figure "I, tomove the attachment `into itsopferating position'where it' may be pushed inwardly to abut againstthe surface 2l which is on'tbe machine (see inthis connection,4 Figure 6), andwhen the "crane is,`

-swungaroundso thatfit is'in line'withthis surface,` vthe attachment 3i is`then slid inwardly along the upperlevel 4I oi' the crane until it is in the position as shown properlyaligns with the abutment surface 2l and may be clamped in this operative position by a screw or cap' screw Il suitably rotatably supported` in the attachment.V

The overhang provides `anjV improved and -marked advantage in the usev of such attach- 'ments as' it gives 'an increased throat distance in Figure 2, where it and allow's a'niuch greaterrange of movement for operation upon the work. 'Ihe lugs `n "couid not formerly beused on the l'standard whereno overhang was provided becausethey would interv fere with movement ofthe knee` it in its. ex-

treme vertical position. Alsothere wasdanger ofleakage ofthe lubricant was contained in the standardby reason of any openingbe ing drilled ythrough the casinginto the interior."

Where theflugs are positioned at either side oi `this surface, `this danger v is not present." "Ihe "spindle bearin'gf21 runs with. lubrication about it. which lubrication is returnedto the interior oi' the casing by conduits. 8l formed inthe along the overhanging portion thereof andleading back to the interior thereof by which the circulation of the lubricant may be maintained.

By the above arrangement, I have provided an increased support for the spindle and reduce vibration of the spindle, and I am enabled to utilize shorter arbors which are consequently stiiier and thus afford a rmer cutter action. The cutter will thus be less liable to break and a more even cut may be taken. I also have increased the support for the overarm which assists in making the arbor morel rigid. Further, the overhang permits the table to pass beneath it with a greater range for the work, and I also havethe attendant advantages in mounting the attachment in place.

The foregoing description is directed solely towards the construction illustrated, but I desire it to be understood that I reserve the privilege of resorting to all the mechanical changes to which the device is susceptible, the invention being defined and limited only by the terms of the appended claims.

I claim:

1. In a machine tool structure, a rigid generally vertical standard, a xed rigid overhang integral With and extending outwardly from the upper portion of said standard, a rotatable spindle, a plurality of bearings xed in said rigid parts for rotatably supporting said spindle, one of said. bearings being located in said overhanging ,portion and adapted to rigidly support the front portion of said spindle close to its forward extremity.

2. In a machine tool structure, a rigid generally vertical standard, a fixed rigid overhang integral with and extending outwardly from the upper portion of said standard, a rotatable spindle, front, intermediate and rear bearings fixed in the rigid standard parts with the front bearing located in said overhanging portion and adapted to rigidly support the front portion of said spindle beyond the front wall of the standard and close to its forward extremity.

3. In a machine tool structure, a rigid generally vertical standard, a fixed rigid overhang, integral with and extending outwardly from the upper portion of said standard, a rotatable spindle, front, intermediate and rear bearings xed in the rigid Standard parts with the front bearing located in said overhanging portion with a portion forward of the front wall of the standard and adapted to rigidly support the front portion of said spindle close to its forward extremity, and said intermediate bearing being located adiacent said front bearing.

4. In a machine tool structure, a rigid generally vertical standard, a fixed rigid overhang integral with and extending outwardly from the upper portion of said standard, a rotatable spindle, front, intermediate and rear bearings fixed in the rigid standard parts with the front bearing located in said overhanging portion with a portion forward of thefront wall of the standard and adapted to rigidly support the front portion of said spindle close to its forward extremity, said intermediate bearing being located above the front wall of the standard and adjacent said front bearing, and said rear bearing located close to the rearward extremity of said spindle and in the rear wall of the standard.

5. In a machine tool structure, a rigid hollow standard, a rotatable spindle, a knee slldable for vertical movement along the lower portion of said standard, a work carriage movable towards and from said standard and reciprocable in a direction transverse to the axis of said spindle, a fixed rigid overhang intergal with and extending outwardly from the upper portion of said standard over said knee, a plurality of bearings fixed in said rigid parts for rotatably supporting said spindle, one of said bearings being located/'in said overhanging portion and adapted to rigidly support the front portion of said spindle close to its forward extremity, and over the path of movement of said carriage. Y

6. In a machine tool structure, a rigid hollowupright standard having a front and a rear wall, a fixed rigid overhang integral with said front wall at its upper portion and extending outwardly and forwardly therefrom, a rotatable spindle, and front and rear bearings for rotatably supporting said spindle in said rigid parts, said front bearing being located in said overhanging portion and supporting ,the front` portion of the spindle to a point beyond the front wall of said standard.

7. In a machine tool structure, a rigid upright hollow standard having a front and a rear wall, a fixed rigid overhang integral with'said front wall at its upper portion and extending outwardly and forwardly therefrom, a rotatable Y spindle, an overarml adjustably supported from the upper portion of said standard and extensible in a direction parallel with the axis of said spindle, a front support for said overarm, and a. front bearing for said spindle, both support and bearing being located in said overhanging portion and supporting the front portions of the overarm and spindle to a point beyond the front wall of said standard.

8. In -a milling machine, a rigid hollow upright standard having a front and a rear wall, a rotatable spindle, a knee slidable for vertical movement along the lower portion of said standard, a work carriage movable towards and from said standard and reciprocable in a direction transverse to the axis of said tool spindle, a xed rigid overhang extending forwardly from the front wall of said standard at its upper portion, and over said knee, and front and rear bearings for rotatably supporting said spindle and fixed in said rigid parts, said front bearing being located in said overhanging portion and supporting the front portion of said spindle adjacent the front of said overhanging portion and beyond the front wall of said standard.

9. In a milling machine, a rigid hollow upright standard having a front and a rear wall, a rotatable tool spindle, a knee slidable for vertical movement along the lower portion of the front wall of said standard, a work carriage mov-` able towards and from said standard and reciprocable in a direction transverse lto the axis of said spindle, a ixed rigid overhang extending `forwardly from the front wall of said standard at its upper portion and over said knee, an overarm adjustably supported from the upper portion of said standard and extensible in a direction parallel with the axis of said spindle, front and rear supports for said overarm, and front and rear bearings Afor rotatably supportingusaid spindle both xed in said rigid parts, said front support and bearing being both located in said overhanging portion and supporting the front portion of said overarm and spindle adjacent an end of said overhanging portion and beyond the front wall of said standard.

BENJAMIN P. GRAVES. 

